The Stacks project

Fix type in stacks-sheaves

Thanks to ZL
https://stacks.math.columbia.edu/tag/073M#comment-8566

Fix typo in stacks-sheaves.tex

Thanks to Yogesh More
http://stacks.math.columbia.edu/tag/076P#comment-1424

Also tried to tighten up code in two-commutative diagram with the hope
that xyjax can parse it better this way.

LaTeX: \etale

Introduced the macro

\def\etale{{\acute{e}tale}}

and replaced all occurences of \acute{e}tale by \etale

Reorganization material in Sheaves on Stacks

	Improved handling of restriction to algebraic spaces.

Splitting out lemmas

Comparison

	Extremely boring comparison result between big and small sites
	of schemes and for algebraic stacks representable by algebraic
	spaces. Still preparing for a discussion of cohomology of
	quasi-coherent sheaves on algebraic stacks.

Tags: Added new tags

Comparing sheaves

	Now that we are getting close to writing something more
	substantial about cohomology of sheaves on algebraic stacks we
	need to make sure that we can match this material with the
	earlier results on algebraic spaces. This commit contains a
	lemma whose proof isn't complete -- and whose proof isn't
	trivial (despite having all appearences of being trivial).

	Side comment: It seem quite reasonable to never introduce the
	big fppf (etc) site of an algebraic space in the stacks
	project. After all, given an algebraic space we can think of it
	as an algebraic stack and then we have the big site built into
	it. This would avoid a certain amount of duplicity with the
	material on big sites of schemes.